TIL of the brown paper bag test, which was used within African-American society. If an individual’s skin colour was darker than the bag, they were not to be admitted into social groups.

https://en.wikipedia.org/wiki/Brown_paper_bag_test

https://www.reddit.com/r/todayilearned/comments/15xzj0r/til_of_the_brown_paper_bag_test_which_was_used/